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International Design and Test Workshop

作者： Yasser M. Seddiq Sami M. Alhumaidi Saleh A. Alshebeili Abdulfattah M. Obied The National Program of Electronics Communication and Photonics KACST Riyadh Saudi Arabia Department of Electrical Engineering King Saud University Riyadh Saudi Arabia

ISBN: (纸本)9781424457489

This paper presents the realization of the forward automatic censored cell averaging detector (F-ACCAD), a novel CFAR algorithm for detecting targets in log-normal distribution clutter recently published . The algorithm is realized through an FPGA-based parallel architecture. The timing constraints of high resolution radar applications are considered and satisfied in the system. The sequential nature of the algorithm has been parallelized to achieve the desired processing delay. The intensive statistical calculations and the complexity of the algorithm have been significantly reduced by using lookup tables (LUTs). Batcher's sort, a parallel sorting algorithm, is adopted in this work. The hardware synthesis results and timing analysis are reported at the end.

关键词： Table lookup Arithmetic Radar detection Timing Detectors Log-normal distribution Clutter Parallel architectures Radar applications Delay

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Constructive algorithms for determining inverses and syndrome matrices of multidimensional convolutional encoders using the Gröbner basis approach

Constructive algorithms for determining inverses and syndrom...

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Asia-Pacific Conference on communications

作者： C. Charoenlarpnopparut Pramote Jangisarakul Electronics and Communication Engineering Program Sirindhorn International Institute of Technology Thammasat University Thailand

A representation of an m-D convolutional encoder is analogous to the representation of a transfer function for a MIMO m-D FIR system. The encoder matrix is usually not square and thus finding its inverse typically employs the Moore-Penrose generalized inverse. However, the result may not be FIR (polynomial matrix) even if the generator matrix is a polynomial. In this paper a constructive algorithm based on the usage of Grobner basis is presented along with detailed examples. The result obtained can be parameterized to cover the class of all possible FIR inverses. In addition, by using the computation method of syzygy with the Grobner basis module, the syndrome matrix for a given m-D convolutional encoder is shown.

关键词： Multidimensional systems Polynomials Convolutional codes Finite impulse response filter Equations Decoding Transfer functions MIMO Error correction codes Error correction

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Finite support 2-D FIR QMF PR filter bank design by spectral factorization using Gröbner basis

Finite support 2-D FIR QMF PR filter bank design by spectral...

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Asia-Pacific Conference on communications

作者： A. Thamrongmas C. Charoenlarpnopparut Electronics and Communication Engineering Program School of Communications Instrumentations & Control Sirindhorn International Institute of Technology Thammasat University Thailand

In this paper, the application of spectral factorization by using Grobner basis approach to the problem of 2-D finite support QMF filter bank design is proposed along with illustrative example. Earlier, it has been shown that the Grobner basis can be applied to solve the problem of 2-D factorization and its effectiveness in dealing with polynomial equation system are demonstrated. Despite the fact that there exist many good techniques for designing one dimensional QMF synthesis and analysis filter banks, the two-dimensional counterpart has a major bottleneck due to the generalization of 2-D spectral factorization. The proposed algorithm is the direct generalization of the 1-D QMF filter bank design by spectral factorization. Furthermore, the filter coefficients can be computed in symbolic forms and thus provide a good opportunity for further optimization if additional criteria are given.

关键词： Finite impulse response filter Filter bank OFDM Video coding Resource management Base stations Broadcasting Frequency synchronization Interchannel interference Wireless communication

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Performance Analysis of High Order Modulation Schemes in the wireless communication System

Performance Analysis of High Order Modulation Schemes in the...

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International Conference on Advanced communication Technology (ICACT)

作者： Inkwon Seo Seyoung Won Younglok Kim Mobile Communication Technology Laboratory Chief Technology Officer Division LG Electronics Limited Seoul South Korea Department of Electronic Engineering and Program of Integrated Biotechnology Sogang University Seoul South Korea

This paper compares that the analyzed efficiency about the case which will adopt the modulation method of the high-order unit for raising a data rate from wireless telecommunication system. The quadrature-carrier AM (QAM) of the rectangular square form which is used mainly in existing have excellent bit-error rate (BER) efficiency from it compares in different modulation method and the quality. But the number of amplitude increases to follow, the dynamic range of transfer & receiver signal increases and the limit gets in selection of the amplifier, the error occurrence rate from amplification process increases. Amplitude phase-shift keying (APSK) modulation is visible to a BER and the performance degradation of some, quadrature-carrier AM (QAM). It is compared with QAM. But because of the dynamic range (DR) the transmission signal obtained a profit specially in code-division multiple access (CDMA) or orthogonal frequency division multiplexing (OFDM) with the multi signal transfer as sum of signal. It is useful in the modulation method of the higher-order unit for a system. Also the use of the non-linear amplifier where the case of power efficiency of the APSK is good is possible and there is a possibility of getting a big profit even from the system embodiment side. This paper simulates that it led from the universal mobile telecommunication system terrestrial radio access (UTRA) time division duplex (TDD) system environment and gave some proof.

关键词： Performance analysis Wireless communication Quadrature amplitude modulation Bit error rate Dynamic range OFDM modulation Multiaccess communication Signal processing Phase shift keying Phase modulation

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MARKOV DECISION PROCESSES WITH UNCERTAIN TRANSITION RATES: SENSITIVITY AND MAX HYPHEN MIN CONTROL

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Asian Journal of Control 2008年第2期6卷

作者： Suresh Kalyanasundaram Edwin K. P. Chong Ness B. Shroff Motorola India Electronics Limited No. 66/1 Plot 5 Bagmane Techpark C. V. Raman Nagar Post Bangalore 560 093 India. Department of Electrical and Computer Engineering Colorado State University Fort Collins CO 80523-1373 USA. Professor Edwin K. P. Chong received the B.E.(Hons.) degree with First Class Honors from the University of Adelaide South Australia in 1987 graduating top of his class and the M.A. and Ph.D. degrees in 1989 and 1991 respectively both from Princeton University where he held an IBM Fellowship. He joined the School of Electrical and Computer Engineering at Purdue University in 1991 where he was named a University Faculty Scholar in 1999 and promoted to Full Professor in 2001. Since August 2001 he has been a Professor of Electrical and Computer Engineering and Professor of Mathematics at Colorado State University. His current interests are in communication networks and optimization methods. He coauthored the best-selling book An Introduction to Optimization 2nd Edition Wiley-Interscience 2001. He received the NSF CAREER Award in 1995 and the ASEE Frederick Emmons Terman Award in 1998. He coauthored a paper that was awarded Best Paper in the journal Computer Networks 2003. Professor Chong is a Fellow of the IEEE. He was founding chairman of the IEEE Control Systems Society Technical Committee on Discrete Event Systems and until recently served as an IEEE Control Systems Society Distinguished Lecturer. He has been on the editorial board of the IEEE Transactions on Automatic Control. He is currently on the editorial board of the journal Computer Networks. He has also served on the organizing committees of several international conferences. He has been on the program committees for the IEEE Conference on Decision and Control the American Control Conference the IEEE International Symposium on Intelligent Control IEEE Symposium on Computers and Communications and the IEEE Global Telecommunications Conference. He has also served in the executive committees for the IEEE Co

Solution techniques for Markov decision problems rely on exact knowledge of the transition rates, which may be difficult or impossible to obtain. In this paper, we consider Markov decision problems with uncertain transition rates represented as compact sets. We first consider the problem of sensitivity analysis where the aim is to quantify the range of uncertainty of the average per-unit-time reward given the range of uncertainty of the transition rates. We then develop solution techniques for the problem of obtaining the max-min optimal policy, which maximizes the worst-case average per-unit-time reward. In each of these problems, we distinguish between systems that can have their transition rates chosen independently and those where the transition rates depend on each other. Our solution techniques are applicable to Markov decision processes with fixed but unknown transition rates and to those with time-varying transition rates.

关键词： Markov decision processes sensitivity max-min control call admission control policy iteration

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The Effects of Varying Tilt Angle of Halo Implant on the Performance of Sub 100nm LAC MOSFETs

The Effects of Varying Tilt Angle of Halo Implant on the Per...

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International Conference on Industrial and Information Systems, ICIIS

作者： Partha Sarkar Abhijit Mallik Chandan Kumar Sarkar V. Ramgopal Rao Department of Electronics & Telecommunication Engineering Jadavpur University Kolkata India Q.I.P. program of AICTE Orissa Engineering College Bhubaneswar Orissa India Department of Electronics & Communication Engineering Kalyani Government Engineering College India Department of Electrical Engineering Indian Institute of Technology Bombay India

In this paper we systematically investigate the effects of the varying tilt angle of the halo implants on the different device performance parameters of 100 nm lateral asymmetric channel (LAC) MOSFETs. The tilt angle is varied from 5deg to 60deg with twist angle 0deg. Substantial reduction of sub-threshold swing is found for large tilt angles as compared to low angles of halo implant. The device structure, known as lateral asymmetric channel with large angle tilt implant (LACLATI), exhibits better reverse short channel effect and I on /I off , and lower junction capacitance

关键词： Implants Los Angeles Council MOSFETs Threshold voltage Industrial electronics Educational institutions Capacitance communication industry electronics industry Information systems

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Carrier confinement effect enhanced by AlGaN/GaN multi-quantum barrier in AlInGaN based high power blue-violet laser diodes

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Physica Status Solidi (C) Current Topics in Solid State Physics 2006年第6期3卷 2215-2218页

作者： Lee, Sung-Nam Cho, S.Y. Ha, K.H. Choi, K.K. Jang, T. Chae, S.H. Kim, H.K. Paek, H.S. Sung, Y.J. Sakong, T. Son, J.K. Ryu, H.Y. Kim, Y.H. Yoon, E. Nam, O.H. Park, Y. Photonics Program Team Samsung Advanced Institute of Technology Suwon Korea Republic of Communication Module Lab. Samsung Electronics Suwon Korea Republic of CSEL School of Materials Science and Engineering Seoul National University Seoul Korea Republic of

AlGaN/GaN multi-quantum barriers (MQBs) were firstly introduced into violet AlInGaN laser diodes with InGaN multi-quantum wells structure, resulting in drastic improvements in lasing performance. Comparing with conventional AlGaN single electron blocking layer (EBL), lower threshold current and higher slope efficiency at room temperature could be achieved by AlGaN/GaN multiquantum barrier. It can be explained that p-type AlGaN/GaN MQBs is more effective to suppress the overflow of electron than single p-type AlGaN EBL by the increase of effective barrier heights due to the quantum effect of MQB and the enhancement of p-type doping efficiency. Additionally, the strain effect in InGaN multi-quantum wells (MQWs) from single p-type AlGaN EBL can be reduced by forming the AlGaN/GaN super lattice structure. © 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Aluminum gallium nitride

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Nonlinear H∞ for spacecraft attitude control

Nonlinear H∞ for spacecraft attitude control

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作者： Shou, Ho-Nien Jan, Ying-Wen Department of Aviation and Communication Electronics Air Force Institute of Technology United States Mechanical Engineering Department National Space Program Office Taiwan

ISBN: (纸本)008045108X

This paper presents a nonlinear H∞ state feedback attitude control design method for spacecraft large angle maneuvers, which is subject to moment-of-inertia (MOI) uncertainty. Moreover, the operation of attitude maneuver is affected by external disturbances. The attitude control design thus employs a nonlinear H∞ method to achieve stability and robustness so that both MOI uncertainty and external disturbances can be accounted for. in the paper, a solution for robust spacecraft attitude control is conjectured and shown to satisfy the nonlinear H∞ criterion. This results in a nonlinear H∞ control law that is capable of robustly stabilizing the maneuver in the presence of external disturbance and spacecraft inertia uncertainty. The simulation results are presented to demonstrate the effectiveness of the proposed design method. Copyright © 2005 IFAC.

关键词： Attitude control

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NONLINEAR H ∞ FOR SPACECRAFT ATTITUDE CONTROL

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IFAC Proceedings Volumes 2005年第1期38卷 49-54页

作者： Ho-Nien Shou Ying-Wen Jan Department of Aviation & Communication Electronics Air Force Institute of Technology Mechanical Engineering Department National Space Program Office

This paper presents a nonlinear H ∞ state feedback attitude control design method for spacecraft large angle maneuvers, which is subject to moment-of-inertia (MOI) uncertainty. Moreover, the operation of attitude maneuver is affected by external disturbances. The attitude control design thus employs a nonlinear H ∞ method to achieve stability and robustness so that both MOI uncertainty and external disturbances can be accounted for. In the paper, a solution for robust spacecraft attitude control is conjectured and shown to satisfy the nonlinear H ∞ criterion. This results in a nonlinear H ∞ control law that is capable of robustly stabilizing the maneuver in the presence of external disturbance and spacecraft inertia uncertainty. The simulation results are presented to demonstrate the effectiveness of the proposed design method.

关键词： moment-of-inertia uncertainty nonlinear robust control large angle attitude maneuver external disturbances

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A comparative evaluation of competitive learning algorithms for edge detection enhancement

A comparative evaluation of competitive learning algorithms ...

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13th European Signal Processing Conference, EUSIPCO 2005

作者： Sirin, Tuba Saglam, Mehmet Izzet Erer, Isin Gokmen, Muhittin Ersoy, Okan Informatics Institute Advanced Technologies in Engineering Computer Science and Engineering Maslak Istanbul 34469 Turkey Informatics Institute Advanced Technologies in Engineering Satellite Communication and Remote Sensing Program Maslak Istanbul 34469 Turkey Faculty of Electrical and Electronic Engineering Electronics and Communication Department Maslak Istanbul 34469 Turkey Faculty of Electrical and Electronic Engineering Computer Engineering Department Istanbul Technical University Maslak Istanbul 34469 Turkey Purdue University School of Electrical and Computer Engineering West Lafayette IN United States

ISBN: (纸本)1604238216

Most edge detection algorithms include three main stages: smoothing, differentiation, and labeling. In this paper, we evaluate the performance of algorithms in which competitive learning is applied first to enhance edges, followed by an edge detector to locate the edges. In this way, more detailed and relatively more unbroken edges can be found as compared to the results when an edge detector is applied alone. The algorithms compared are K-Means, SOM and SOGR for clustering, and Canny and GED for edge detection. Perceptionally, best results were obtained with the GED-SOGR algorithm. The SOGR is also considerably simpler and faster than the SOM algorithm.

关键词： Edge detection

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